Avalanche Bulletin
更新日時: 2025/02/12 06:00
Myoko
Alpine Low
Treeline Low
Below Treeline Good
信頼度：○ good □ Fair △ Low
Travel and Terrain Advice
Watch out for wind slabs in alpine and treeline areas. Strong winds yesterday caused slabs to form in various locations. Be especially vigilant in areas where avalanches are more likely to occur, such as convex or unsupported terrain. Also, remember that slab hardness may change during the day on steep south-facing slopes that receive a lot of solar radiation, making them more prone to triggering. A hard snow surface does not mean safety. Snow is well cooled by radiative cooling. If you choose simple terrain, free from the influence of wind, you will enjoy great powder snow. Keep good communication with your companions and make good use of the safe zones. Have a good day.
Avalanche Problem
ウインドスラブ Wind slab
If there is a snow plume in action, still consider that a new slab is being built. The Niigata District Meteorological Office has issued a high wind advisory for the Joetsu region.
ストームスラブ Storm slab
Note the very steep slopes affected by sunny slopes where the surface layer of snow has strong slab characteristics.
概要
Avalanche
Several size 1 avalanches were reported in the treeline below yesterday (11th). All were triggered by skiers. Short shooting cracks were also reported. No reports have been received at higher elevations.
Snowpack
The stormy weather that began on February 4 ended completely yesterday afternoon. The lower layers of the storm snow have been sintering steadily, and the upper snowpack is composed of fresh snow that fell over the past two days. This snow near the snow surface layer has been moved by yesterday's strong westerly winds, forming a wind slab on the downwind side. At higher elevations, wind slab formation is likely to be more pronounced, so greater caution is needed. Today's warming temperatures and warm winds will help to resolve the instability of the storm snow.
Weather
The Japan Meteorological Agency is forecasting a southerly wind, later westerly, strong, clear, later cloudy, nightly, rainy, daytime high of 6 °C (13 m elevation) for the Joetsu region of Niigata Prefecture. At Sasagamine, Myoko (elevation 1,310 m), the temperature is -14 °C (as of 4:45 a.m.), with 0 cm of snow having fallen in the past 12 hours and 20 cm in the past 24 hours.
